通过过滤器（Filter）解决JSP的Post和Request中文乱码问题

jsp代码：

import javax.servlet.*;
import javax.servlet.http.*;

public class charsetfilter implements filter
{
  public void destroy() 
  {
    
  }
  public void dofilter(servletrequest request, servletresponse response, filterchain chain) 
  {
    try
    {
      httpservletrequest httprequest = (httpservletrequest)request;
      string method = httprequest.getmethod().tolowercase();
      if(method.equals("post"))
      {
        //如果是post，即表单方法，直接设置charset即可
        request.setcharacterencoding("utf-8");
      }
      else if(method.equals("get"))
      {
        //如果是get方法
        request.setcharacterencoding("utf-8");
        request = new httpservletrequestwrapper((httpservletrequest)request)
        {
          public string getparameter(string str)
          {
            try
            {
              return new string(super.getparameter(str).getbytes("iso-8859-1"),"gbk");
            }
            catch(exception e)
            {
              return null;
            }
   
          }
        };
      }
      
      chain.dofilter(request, response);
    }
    catch(exception e){}
  }
  
  public void init(filterconfig filterconfig) 
  {
    
  }
}

过滤器配置：

<filter>
    <filter-name>charfilter</filter-name>
    <filter-class>charsetfilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>charfilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>request</dispatcher>
</filter-mapping>